unify structure info.

docs/scarpet/Full.md

@@ -689,15 +689,22 @@ number('3bar') => null
 number('2')+number('2') => 4
 </pre>
 
-### `str(expr, params? ... ), str(expr, param_list)`
+### `str(expr)`,`str(expr, params? ... )`, `str(expr, param_list)`
 
-Returns a formatted string representing expression. Accepts formatting style accepted by `String.format`. 
-Supported types (with `"%?"` syntax):
+If called with one argument, returns string representation of such value.
+
+Otherwise, returns a formatted string representing the expression. Arguments for formatting can either be provided as
+ each consecutive parameter, or as a list which then would be the only extra parameter. To format one list argument
+ , you can use `str(list)`, or `str('foo %s', l(list))`.
+
+Accepts formatting style accepted by `String.format`. 
+Supported types (with `"%<?>"` syntax):
 
 *   `d`, `o`, `x`: integers, octal, hex
 *   `a`, `e`, `f`, `g`: floats
 *   `b`: booleans
 *   `s`: strings
+*   `%%`: '%' character
 
 <pre>
 str(null) => null
@@ -2069,13 +2076,17 @@ Returns spawn potential at a location (1.16+ only)
 Checks wordgen eligibility for a structure in a given chunk. If no structure is given, or `null`, then it will check
  for all structures. If bounding box of the structures is also requested, it will compute size of potential
   structures. This function, unlike other in the `structure*` category is not using world data nor accesses chunks
-  making it preferred for scoping ungenerated terrain.
+  making it preferred for scoping ungenerated terrain, but it takes some compute money to calculate the structure.
+  
+  Unlike `'structure'` this will return a tentative structure location. Random factors in world generation may prevent
+  actual structure from forming.
   
 If structure is specified, it will return `null` if a chunk is not eligible, `true` if the structure should appear, or 
-a pair of coordinates indicating bounding box of the structure.
+a map with two values: `'box'` for a pair of coordinates indicating bounding box of the structure, and `'pieces'` for 
+list of elements of the structure (as a tuple), with its name, direction, and box coordinates of the piece.
 
 If structure is not specified, it will return a set of structure names that are eligible, or a map with structures
-as keys, and pair of bounding box coordinates as values. An empty set or an empty map would indicate that nothing
+as keys, and same type of map values as with a single structure call. An empty set or an empty map would indicate that nothing
 should be generated there.
 
 
@@ -2085,7 +2096,8 @@ Returns structure information for a given block position. Note that structure in
 blocks from the same chunk. `structures` function can be called with a block, or a block and a structure name. In 
 the first case it returns a map of structures at a given position, keyed by structure name, with values indicating 
 the bounding box of the structure - a pair of two 3-value coords (see examples). When called with an extra structure 
-name, returns list of components for that structure, with their name, direction and two sets of coordinates 
+name, returns a map with two values, `'box'` for bounding box of the structure, and `'pieces'` for a list of 
+components for that structure, with their name, direction and two sets of coordinates 
 indicating the bounding box of the structure piece.
 
 ### `structure_references(pos), structure_references(pos, structure_name)`